Toilets maps are not new. Juvenile, sure (who can imagine a National Continence Management Strategy?). Incredibly useful: the city is a wilderness of biological control in pay for access and clandestine movements, compared to the free toilet “wilderness” of Swedish forest or Sierra mountains.
The National Public Toilet Map by the Australian Government, is a model of targetted, usable location based service. Browse or search by address or lat/lon. Per toilet info: opening hours, nearby services, provider info, nearby toilets (in case this one is getting cleaned). A trip planner and personalization (favorites etc). Apparently frequently updated.
Still needs: mobile device interface, for in situ use. open data, for recombinant growth .. discussion forums and rating systems, sharing favorites, integration with other data sources (say pub locations for more relaxed crawls).